Synthetic Studies on the Polyene Macrolide Antibiotics. Development of syn- and anti-1,3-Diol Subunits and Assembly of the Polyacetate Region of Amphotericin B
摘要:
The synthesis of syn- and anti-1,3-diol subunits from thiol ester oxazoline 4 has been described. The key features of these synthetic sequences include the stereodivergent allylation of an asymmetric beta-amino aldehyde (7) and the stereospecific transformation of a vicinal amino alcohol to an epoxide. The resultant diasteromeric silyl-protected epoxy alcohols (10s and 10a) serve as convenient precursors to the isomeric diol aldehyde derivatives 13, 13-ent, and 16. One of these fragments, compound 13, has been exploited in a highly convergent synthesis of the C1-C13 polyacetate segment of amphotericin B.
Studies toward the application of oxazolineepoxide equivalency in 1,3-asymmetric induction
作者:Kenneth R. Overly、J.Michael Willams、Glenn J. McGarvey
DOI:10.1016/s0040-4039(00)97679-2
日期:1990.1
Efficient Asymmetric Total Syntheses of Cryptocarya Triacetate, Cryptocaryolone, and Cryptocaryolone Diacetate
作者:Xiaolei Wang、Wenkuan Wang、Huaiji Zheng、Yingpeng Su、Tuo Jiang、Yongping He、Xuegong She
DOI:10.1021/ol901024t
日期:2009.7.16
Concise and efficient asymmetric total syntheses of three substituted alpha-pyrone-type natural products have been accomplished via 7-9 steps from 5b in high overall yields, which involve linchpin coupling, ring-closing metathesis, and a tandem sequence of deacetylation and intramolecular oxa-Michael addition as the key steps.
OVERLY, KENNETH R.;WILLIAMS, J. MICHAEL;MCGARVEY, GLENN J., TETRAHEDRON LETT., 31,(1990) N2, C. 4573-4576
作者:OVERLY, KENNETH R.、WILLIAMS, J. MICHAEL、MCGARVEY, GLENN J.