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91.
The use of chiral alcohols to form the Lewis acid-base *RO(-)→ bis(pinacolato)diboron adduct, in situ, provides an opportunity to induce asymmetry in the organocatalytic diboration of alkenes and complements the well established transition metal-mediated enantioselective diboration. 相似文献
92.
A practical and versatile method for the synthesis of 1-thio-phytosphingolipid analogs through regioselective nucleophilic ring-opening reactions of phytosphingosine aziridine derivatives with thiols is described. The reactions were carried out with N-acylaziridines and a variety of thiol compounds. Microwave irradiation highly improved the yield of the ring-opening reaction and the intermediate N-acyl adducts were converted into 1-S-phytosphingolipid analogs, such as phytoceramide and phytosphingosine derivatives. 相似文献