The asymmetric synthesis of the macrolide antibiotics (+)-rutamycin B (1) and (+)-oligomycin C (2) is described. The approach relied on the synthesis and coupling of the individual spiroketal fragments 3a and 3b with the C1-C17 polyproprionate fragment 4. The preparation of the spiroketal fragments was achieved using chiral (E)-crotylsilane bond construction methodology, which allowed the introduction
Crotylsilane Reagents in the Synthesis of Complex Polyketide Natural Products: Total Synthesis of (+)-Discodermolide
作者:Alexander Arefolov、James S. Panek
DOI:10.1021/ja043168j
日期:2005.4.1
convergent stereocontrolled synthesis of (+)-discodermolide has been achieved with 2.1% overall yield (27 steps longest linear sequence). The absolute stereochemistry of the C1-C6 (12), C7-C14 (13), and C15-C24 (11) subunits was introduced using asymmetric crotylation methodology. Key elements of the synthesis include the use of hydrozirconation-cross-coupling methodology for the construction of C13-C14
Application of chiral (E)-crotylsilanes in synthesis: The asymmetric synthesis of the C1C17 polypropionate fragment of rutamycin B
作者:Nareshkumar F. Jain、James S. Panek
DOI:10.1016/s0040-4039(97)00095-6
日期:1997.2
The asymmetric synthesis of the polypropionate fragment of rutamycin B is reported employing chiral allylsilane bond construction methodology for the introduction of six of the nine stereogenic centers. In this paper, the construction of the C3-C12 subunit and its coupling to the aldehyde 12 through a Mukaiyama-type aldol reaction are described. (C) 1997 Published by Elsevier Science Ltd.