Empirical Model for the Molar Rotations of syn-2,2-Dimethyl-1,3-dioxanes
摘要:
[GRAPHICS]A useful method for the prediction of molar rotation ([Phi]) of syn-2,2-dimethyl-1,3-dioxanes (acetonides) is described. A series of acetonides were prepared by standard methods. A simple additive relationship between the substituents (R, R') and molar rotation was realized.
An effective extension of the polyacetate chain in the polyene macrolide antibiotic filipin III, based on chiral oxazaborolidinone-promoted asymmetric aldol reactions
摘要:
The enantioselective construction of the iterative polyacetate unit 3 in filipin III has been accomplished, essentially by an aldol strategy based on chiral oxazaborolidinone-promoted asymmetric aldol reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.