Studies for the enantiocontrolled preparation of substituted tetrahydropyrans: applications for the synthesis of leucascandrolide A macrolactone
摘要:
Strategies for the stereocontrolled preparations of 2,6-cis- and 2,6-trans-substituted tetrahydropyrans have been devised. These studies have explored methodology for asymmetric induction in S-E' reactions using chiral 1,3,2-diazaborolidine controllers. Reactions with aldehydes at -78 degrees C yield nonracemic 1,5-diols for chemoselective internal backside displacements. This concept is developed as a flexible and reliable strategy in studies toward leucascandrolide A macrolactone 2 via the sequential applications of S-E' reactions leading to the C-1-C-9 aldehyde 14, and the bis-tetrahydropyran 59, respectively. (C) 2011 Elsevier Ltd. All rights reserved.
The synthesis of the C1–C27 fragment of hemicalide, a marinemetabolite displaying a unique potent antiproliferative activity, has been accomplished. The synthetic approach highlights a remarkably efficient ring-closing metathesis reaction catalyzed by Nolan ruthenium indenylidene complexes to elaborate the highly substituted δ-lactone framework.
Enantioselective Synthesis of Altohyrtin C(Spongistatin 2): Synthesis of the AB- and CD-Spiroketal Subunits
作者:David A. Evans、Paul J. Coleman、Luiz Carlos Dias
DOI:10.1002/anie.199727381
日期:1997.1.7
Allyltrichlorostannane additions to chiral aldehydes
作者:Luiz Carlos Dias、Débora Ribeiro dos Santos、Leonardo José Steil
DOI:10.1016/s0040-4039(03)01713-1
日期:2003.9
Chiral and achiral allyltrichlorostannanes reacted with chiral beta-alkoxy and syn and anti alpha-methyl-beta-alkoxy aldehydes to give the corresponding homoallylic alcohols with moderate to high diastereoselectivities. (C) 2003 Elsevier Ltd. All rights reserved.
Dias, Luiz C.; Meira, Paulo R. R., Synlett, 2000, # 1, p. 37 - 40
作者:Dias, Luiz C.、Meira, Paulo R. R.
DOI:——
日期:——
On 1,4-diastereoselectivity in the chiral allylsilane addition to chiral α-substituted aldehydes
作者:Luiz C. Dias、Rosana Giacomini
DOI:10.1016/s0040-4039(98)01066-1
日期:1998.7
Chiral allylsilane 2 reacted with chiral alpha-substituted aldehydes to afford the corresponding 1,4-syn-products with good diastereoselectivities. The best selectivities are observed when the reactions are carried out by transmetallation of allylsilane using Tin (IV) chloride in CH2Cl2, at -78 degrees C, before addition of the aldehydes. (C) 1998 Elsevier Science Ltd. All rights reserved.