作者:K. C. Nicolaou、Christopher F. Claiborne、Kumarapandian Paulvannan、Maarten H. D. Postema、Rodney K. Guy
DOI:10.1002/chem.19970030311
日期:——
We designed and targeted for synthesis the C-ringaryltaxoids 2a-c in order to develop methods for the construction of the taxoid skeleton and to test their cytotoxicity against tumor cells. Compound 2a was synthesized by a convergent route from hydrazone 5 and aldehyde 4. Key steps included a Shapiro reaction to join 5 and 4, a McMurry coupling to construct the 8-membered ring, a carbonate opening
Total Synthesis of Taxol. 3. Formation of Taxol's ABC Ring Skeleton
作者:K. C. Nicolaou、Z. Yang、J.-J. Liu、P. G. Nantermet、C. F. Claiborne、J. Renaud、R. K. Guy、K. Shibayama
DOI:10.1021/ja00107a008
日期:1995.1
The synthesis of Taxol's ABC ring system has been achieved. The Shapiro coupling of an aldehydic C ring synthon (8) with an anionic A ring synthon derived from hydrazone 9 gave, diastereoselectively, A-B conjugate 10. Functional group manipulations and McMurry ring closure produced the highly functionalized ABC ring system 17. Extensive attempts to optimize the McMurry reaction revealed a single predominant side reaction leading to byproducts 19 and 20. Resolution of the CB,C10-diol (+/-)-17 via its camphanyl esters provided the ABC ring system as its natural isomer (+)17.
Synthesis of competent nucleophiles for delivering the A ring of taxol
作者:Martin J. Di Grandi、David K. Jung、Walter J. Krol、Samuel J. Danishefsky
DOI:10.1021/jo00070a040
日期:1993.8
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.
Synthesis of Novel Taxoids
作者:K. C. Nicolaou、Christopher F. Claiborne、Philippe G. Nantermet、Elias A. Couladouros、Erik J. Sorensen