Studies directed towards the total synthesis of lycoperdinosides: stereoselective construction of the C1–C9 and C10–C21 segments of the molecules
作者:Tushar Kanti Chakraborty、Rajib Kumar Goswami、Midde Sreekanth
DOI:10.1016/j.tetlet.2007.04.016
日期:2007.6
The three chiral centres of the C1-C9 moiety of the six-membered lactone glycosides, lycoperdinosides A and B, have been derived from a common starting material containing a single chiral centre. In contrast, the C10-C21 segment of these molecules has been synthesized using, as key steps, a highly stereoselective aldol reaction, a Ti(III)-mediated opening of a trisubstituted epoxy alcohol and an efficient directed hydrostannylation of a suitably substituted internal alkyne. (c) 2007 Elsevier Ltd. All rights reserved.