Synthesis of the northern sector (C8–C19) of rapamycin via Chan rearrangement and oxidation of an α-acyloxyacetate
作者:James D. White、Scott C. Jeffrey
DOI:10.1016/j.tet.2009.06.026
日期:2009.8
Two routes to the masked tricarbonyl segment of the immunosuppressant rapamycin comprising C8-C19 were explored beginning from D-xylose. The first approach employed a protected form of 2,4,5-trihydroxypentanol to obtain dithiane 43, which failed to react with dimethyl oxalate to give a 1,2,3-tricarbonyl unit corresponding to the northern sector of rapamycin. A second approach employing carboxylic acid 61 derived from 43 utilized base-mediated (Chan) rearrangement of alpha-acyloxyacetate 62 with trapping of the resultant enediolate as bis silyl ether 63. Epoxidation of this diene afforded masked tri-keto ester 65 which underwent acid-catalyzed methanolysis to produce cyclic ketal 67. (C) 2009 Elsevier Ltd. All rights reserved.