BF3 mediated one-pot conversion of 3-O-acyl-d-glucose-1,2:5,6-diacetonide derivatives to 5-O-acyl-3,6-anhydro-d-glucose is described through a tandem selective intramolecular cyclization sequence. 相似文献
Catalytic rivals : Both CO2‐protected tetrahydropyrimidin‐2‐ylidene‐based N‐heterocyclic carbenes (NHCs) and SnII‐1,3‐dimesitylimidazol‐2‐ylidene, as well as SnII‐1,3‐dimesitylimidazolin‐2‐ylidene complexes (example displayed), have been identified as truly latent catalysts for polyurethane (PUR) synthesis rivaling all existing systems both in activity and latency.
Polyethylene glycol (PEG) was found to be an inexpensive non-toxic and effective medium for the one-pot synthesis of highly functionalized pyrroles. Utilizing this protocol various pyrrole derivatives were synthesized in excellent yields. Environmental acceptability, low cost, high yields, and recyclability of the PEG are the important features of this protocol. 相似文献
A short and simple synthesis of tetrahydropyrimidine derivatives were accomplished in good to excellect yields at room temperature by the reaction of dimethylacetalynedicarboxylate, aniline, and formaldehyde in the presence of 5 mol% of molecular iodine at room temperature in ethanol for 5 min. 相似文献
Furan-2(5H)-one derivatives have been synthesized by a simple, efficient, one-pot, three-component condensation of anilines, dimethylacetylenedicarboxylate, and aromatic aldehydes in the presence of a catalytic amount of tin(II) chloride in excellent yields. 相似文献
The total synthesis of sapinofuranone A has been achieved starting from naturally occurring carbohydrate d-ribose via a short and high yielding route. The key transformations include Wittig olefination, Ohira–Bestmann reaction, Sonogashira coupling. Finally acetonide deprotection and subsequent lactonization using catalytic amount of hydrochloric acid completed the total synthesis of sapinofuranone A. 相似文献