The enantioselective total synthesis of the telomerase inhibitor UCS1025A has been accomplished. The key transformation involves a remarkable boron Reformatsky coupling of iodolactone 13 and aldehyde 17.
The enantioselective total synthesis of the telomerase inhibitor UCS1025A has been accomplished. The key transformation involves a remarkable boron Reformatsky coupling of iodolactone 13 and aldehyde 17.
Silylative Dieckmann-Like Cyclizations of Ester-Imides (and Diesters)
作者:Thomas R. Hoye、Vadims Dvornikovs、Elena Sizova
DOI:10.1021/ol061988q
日期:2006.11.9
Trialkylsilyl triflates effect cyclization of ester-imides such as 2 to produce adducts such as 4a. Trapping of the in situ generated, nucleophilic ketene acetal (cf. 5a) is a key aspect of the transformation. A range of substrates amenable to this operationally simple reaction is reported. In many instances the levels of diastereoselectivity are very high. Mechanistic points are inferred from spectroscopic observations.
Total Synthesis of UCS1025A
作者:Tristan H. Lambert、Samuel J. Danishefsky
DOI:10.1021/ja0574567
日期:2006.1.1
The enantioselective total synthesis of the telomerase inhibitor UCS1025A has been accomplished. The key transformation involves a remarkable boron Reformatsky coupling of iodolactone 13 and aldehyde 17.