Stereoselective synthesis of C15C24 and C25C30 fragments of dolabelides
摘要:
The stereocontrolled synthesis of a C15-C24 fragment of dolabelides is reported. The C19 and C21 hydroxyl-bearing stereocenters were installed using ruthenium-mediated asymmetric hydrogenations of cyclic hemiketal 4 and beta-keto ester 7. The C25-C30 portion of dolabelides was prepared as well by ring opening of chiral epoxy alcohol 12 to set up the C27 stereogenic center. (C) 2003 Elsevier Science Ltd. All rights reserved.
Stereoselective synthesis of C15C24 and C25C30 fragments of dolabelides
摘要:
The stereocontrolled synthesis of a C15-C24 fragment of dolabelides is reported. The C19 and C21 hydroxyl-bearing stereocenters were installed using ruthenium-mediated asymmetric hydrogenations of cyclic hemiketal 4 and beta-keto ester 7. The C25-C30 portion of dolabelides was prepared as well by ring opening of chiral epoxy alcohol 12 to set up the C27 stereogenic center. (C) 2003 Elsevier Science Ltd. All rights reserved.
An efficient construction of the C15-C30 segment of the cytotoxic macrolide dolabelide A is described. The synthesis relies on ruthenium-SYNPHOS-mediated asymmetric hydrogenation reactions of beta-keto esters to generate the C19, C21, and C27 hydroxyl-bearing stereocenters with very high levels of enantio- and diastereoselectivity.
Stereoselective synthesis of C15C24 and C25C30 fragments of dolabelides
作者:Nicolas Desroy、Rémi Le Roux、Phannarath Phansavath、Lucia Chiummiento、Carlo Bonini、Jean-Pierre Genêt
DOI:10.1016/s0040-4039(03)00110-2
日期:2003.2
The stereocontrolled synthesis of a C15-C24 fragment of dolabelides is reported. The C19 and C21 hydroxyl-bearing stereocenters were installed using ruthenium-mediated asymmetric hydrogenations of cyclic hemiketal 4 and beta-keto ester 7. The C25-C30 portion of dolabelides was prepared as well by ring opening of chiral epoxy alcohol 12 to set up the C27 stereogenic center. (C) 2003 Elsevier Science Ltd. All rights reserved.