An alternative total synthesis of diplodialide-B

In this paper, an enantioselective synthesis of diplodialide-B has been described. To accomplish this target, a combination of regioselective ring opening of the chiral epoxide, Jacobsen hydrolytic kinetic resolution and Yamaguchi macrolactonization were used as the key steps.     

Total synthesis of proposed structure of xylogiblactone B by chiron approach

Total synthesis of the proposed structure of xylogiblactone B is described using d-(+)-mannitol, regioselective epoxide ring-opening, Yamaguchi esterification, and ring-closing metathesis as key steps.     

The first stereoselective synthesis of dendrodolide A

The first stereoselective total synthesis of natural product, dendrodolide A (1) is described from readily available (R)-propylene oxide and 3-buten-1-ol as starting materials. The synthesis was achieved in 10 steps with an overall yield of 19.1%. The key steps involved in the synthesis are Jacobsen hydrolytic kinetic resolution, epoxide ring opening with 2-allyl-1, 3-dithiane, Yamaguchi esterification, and ring-closing metathesis (RCM).     

Stereoselective synthesis of revised structure of stagonolide G

A concise total synthesis of the revised structure of stagonolide G has been achieved in 11 steps and with an overall yield of 31.7%. Key reaction sequence includes BAIB/TEMPO mediated tandem oxidation and lactonization, Lindlar’s hydrogenation, regioselective epoxide opening by an in situ generated alkynyl as nucleophile, Sharpless asymmetric dihydroxylation, and Jacobsen kinetic resolution.     

First stereoselective total synthesis of decarestrictine O via RCM protocol

A convergent first stereoselective total synthesis of decarestrictine O via RCM protocol starting from 1,3-propanediol and propylene oxide is reported.     

Straightforward synthesis of 4,5-bifunctionalized 1,2-oxazinanes via Lewis acid promoted regio- and stereo-selective nucleophilic ring-opening of 3,6-dihydro-1,2-oxazine oxides

Functionalized 1,2-oxazinanes are interesting and valuable heterocycles with potential applications in synthetic and medicinal chemistry. A straightforward strategy for quick access to unprecedented trans-4-hydroxyl-5-azido/cyano/amino 1,2-oxazinanes are developed: N-COR 3,6-dihydro- 1,2-oxazine oxides are prepared with ease from related dihydro- 1,2-oxazines and opened by nucleophiles TMSN₃, TMSCN and aryl/alkyl amines. Appropriate Lewis acid catalysts are found playing a vital role for both reaction rate and regioselectivity. The N-COR group can be removed under mild conditions to provide highly desirable NH 1,2-oxazinanes inaccessible via previous methods.     

Stereoselective total synthesis of stagonolide E

The first total synthesis of a 10-membered macrolide, stagonolide E is described from readily available 4-penten-1-ol. The synthetic strategy involves Jacobsen’s kinetic resolution, Sharpless epoxidation, Stille-Gennari, and Yamaguchi lactonization as key reactions.     

Stereoselective total synthesis of (+)-cryptocarya diacetate by an iterative Jacobsen’s hydrolytic kinetic resolution protocol

A combination of iterative Jacobsen’s hydrolytic kinetic resolution and reduction of a ketone for the construction of a 1,3-polyol moiety are key steps en route to a total synthesis of (+)-cryptocarya diacetate.     

A concise stereoselective formal total synthesis of the cytotoxic macrolide (+)-Neopeltolide via Prins cyclization

A convergent and highly stereoselective formal total synthesis of the naturally occurring, cytotoxic 14-membered macrolide neopeltolide has been achieved via two Prins cyclizations.     

Total synthesis of catenioblin B

Herein we report the first total synthesis of catenioblin B (1) via a titanium(IV) mediated regioselective epoxide ring-opening, Grignard reaction, Luche’s reduction and TEMPO/BAIB mediated intramolecular cyclization as the key steps.     

A concise total synthesis of biologically active frutinones via tributylphosphine-catalyzed tandem acyl transfer-cyclization

A concise and step-economical total synthesis of biologically active frutinones has been achieved. Tributylphosphine (PBu₃) efficiently induced the tandem acyl transfer-cyclization of carbonates 5 to afford 3-methoxycarbonylflavone derivatives 4 in excellent yields. Finally, concomitant deprotection and lactonization under acidic conditions furnished the desired frutinones A (1a), B (1b), and the proposed structure of frutinone C (1c).     

The stereoselective total synthesis of (+)-garvensintriol

A simple and highly efficient stereoselective total synthesis of (+)-garvensintriol, isolated from the stem bark of Goniothalamus arvensis, is described using Sharpless kinetic resolution, MacMillan α-hydroxylation, and Horner-Wadsworth-Emmons olefination as the key steps.     

A new synthesis of 2-substituted-1,3-dithianes from trichloromethyl compounds

Trichloromethyl compounds are efficiently converted into 1,3-dithianes upon reaction with a disodium 1,3-propanedithiolate-1,3-propanedithiol mixture in DMF solution at 0 °C. This synthesis is limited to those substrates where the substituent attached to the trichloromethyl group is an electron-withdrawing group.     

An efficient and stereoselective route to 1-deoxy-5-hydroxy sphingosine analogues

A short and efficient synthesis of 1-deoxy-5-hydroxy sphingolipid is described. The key steps involved are a Jacobsen hydrolytic kinetic resolution (HKR) and Shibasaki’s asymmetric Henry reaction.     

Enantioselective synthesis of decarestrictine J

An efficient total synthesis of decarestrictine J has been achieved using ring-closing metathesis and Yamaguchi esterification as key steps. The stereogenic centres were generated by means of iterative hydrolytic kinetic resolution (HKR) of racemic epoxides.     

Total synthesis of patulolide A through ring closing metathesis

A simple and efficient total synthesis of patulolide A from readily available 7-octen-1-ol is reported by asymmetric synthetic approach. The key reactions involved are asymmetric dihydroxylation using AD-mix-β and Grubbs’ ring-closing metathesis reaction for the synthesis macrocyclic ring system.     

Efficient total synthesis of iso-cladospolide B and cladospolide B

An efficient synthesis of iso-cladospolide B and cladospolide B has been achieved using Jacobsen’s hydrolytic kinetic resolution (HKR), Sharpless asymmetric dihydroxylation and Yamaguchi macrolactonization as the key steps.     

First asymmetric total synthesis of aspinolide A

The first total synthesis of aspinolide A has been achieved using ring-closing metathesis as a key step. The stereogenic centers were generated by means of hydrolytic kinetic resolution (HKR) of racemic epoxides.     

A furan route to the asymmetric synthesis of trans-fused polyether building blocks

A novel route towards chiral trans-fused polyether lactones 7 and 12 has been developed starting with commercially available furfural. Sharpless kinetic resolution and ring-closing metathesis reactions served as key steps in the strategy.     

A short synthesis of (+) and (−)-falcarinol

A short, practical synthesis of the bis-acetylenic natural product falcarinol 1 is reported. This method relies on the alternate functionalisation of bis-trimethylsilylbutadiyne 10. This may be achieved in one-pot, however, better yields were obtained more conventionally. Lipase mediated enzymatic kinetic resolution of the racemic adduct in an organic solvent afforded (+)-1 in 97% enantiomeric excess. The analogous process performed with racemic 3-acetoxy falcarinol 11 under aqueous conditions gave (−)-1. Oxidation of 1 with Dess-Martin periodinane gave falcarinone 2.