Total Synthesis of taxol. 2. Construction of A and C ring intermediates and initial attempts to construct the ABC ring system
摘要:
A method for the formation of Taxol's ABC ring system has been developed. General methods for the synthesis of versatile synthons for Taxol's A ring (8) and C ring (55) are presented. A model study using a simplified C ring synthon (17) confirmed the viability of the sequential Shapiro-McMurry strategy for formation of Taxol's B ring. Careful exploration of the chemistry of various A-B ring conjugates allowed the development of a successful method for formation of the B ring in a more functionalized system.
Shea, Kenneth J.; Davis, Peter D., Angewandte Chemie, 1983, vol. 95, # 5, p. 422 - 423
作者:Shea, Kenneth J.、Davis, Peter D.
DOI:——
日期:——
Diastereomeric atropisomers of the tricyclo[9.3.1.03,8]pentadecane ring system. Synthesis and structural studies
作者:K. J. Shea、Jeffrey W. Gilman、Curt D. Haffner、T. Kirk. Dougherty
DOI:10.1021/ja00276a041
日期:1986.8
Bonazza, Benedict R.; Peter Lillya; Scholes, Gary, Organometallics, 1982, vol. 1, # 50, p. 137 - 142
作者:Bonazza, Benedict R.、Peter Lillya、Scholes, Gary
DOI:——
日期:——
A tandem radical macrocyclisation-transannular cyclisation approach towards the taxanes
作者:Stephen A. Hitchcock、Stephen J. Houldsworth、Gerald Pattenden、David C. Pryde、Nicholas M. Thomson、Alexander J. Blake
DOI:10.1039/a805268i
日期:——
Separate treatment of the iodotrienedione 19 and the iododienynedione 38 with Bu3SnH–AIBN produces the corresponding taxane ring systems 25 (25–30%) and 56 (50–60%) respectively by way of tandem radical macrocyclisation-radical transannular cyclisations. By contrast the analogous iodopolyenones 61, 63, 65a, 66a, 86a and 87a, together with the corresponding iodoenynones 39a and 59 failed to undergo similar tandem radical reactions, and instead gave products resulting from direct reduction of the carbon–iodine bonds in these substrates. The structures of the taxane analogues 25 and 56 followed from analysis of their NMR spectroscopic data and comparison with similar NMR data for related taxoids described in the literature. The stereochemistry of 56 was secured from an X-ray crystal structure determination of the 1,5-diol 57 produced from reduction of 56 with DIBAL.
Total Synthesis of taxol. 2. Construction of A and C ring intermediates and initial attempts to construct the ABC ring system
作者:K. C. Nicolaou、J.-J. Liu、Z. Yang、H. Ueno、E. J. Sorensen、C. F. Claiborne、R. K. Guy、C.-K. Hwang、M. Nakada、P. G. Nantermet
DOI:10.1021/ja00107a007
日期:1995.1
A method for the formation of Taxol's ABC ring system has been developed. General methods for the synthesis of versatile synthons for Taxol's A ring (8) and C ring (55) are presented. A model study using a simplified C ring synthon (17) confirmed the viability of the sequential Shapiro-McMurry strategy for formation of Taxol's B ring. Careful exploration of the chemistry of various A-B ring conjugates allowed the development of a successful method for formation of the B ring in a more functionalized system.