Synthesis and X-ray crystal structure of (?)-calicheamicinone
作者:Derrick L.J. Clive、Yunxin Bo、Natesan Selvakumar、Robert McDonald、Bernard D. Santarsiero
DOI:10.1016/s0040-4020(98)01140-5
日期:1999.3
Diels-Alder reaction between ketene acetal 3 and the beta-nitroacrylate ester 12 of (-)-8-phenylmenthol gave optically pure ketone 17. This substance was modified in such a way as to remove the chiral auxiliary and afford the epimeric silyl ethers 20M and 20m. Following procedures worked out using racemic materials, both 20M and 20m were converted into optically pure (-)-calicheamicinone (1). This is a crystalline substance, and an X-ray structure determination was carried out. (C) 1999 Elsevier Science Ltd. Ail rights reserved.
Synthesis of (±)-Calicheamicinone by Two Related Methods
作者:D. L. J. Clive、Yunxin Bo、Yong Tao、Sylvain Daigneault、Yong-Jin Wu、Gérard Meignan
DOI:10.1021/ja9602004
日期:1996.1.1
Synthesis of (±)-Calicheamicinone by Two Methods
作者:Derrick L. J. Clive、Yunxin Bo、Yong Tao、Sylvain Daigneault、Yong-Jin Wu、Gérard Meignan
DOI:10.1021/ja980292s
日期:1998.10.1
(E)-3-nitropropenoate to afford ketone 27. This was converted by two routes into (±)-calicheamicinone (1). In the first, modification of the nitro, ester, and allyl substituents gave ketone 38, which reacted stereoselectively with cerium trimethylsilylacetylide to place the acetylene unit syn to the nitrogen function (38 → 39). Further elaboration took the route as far as aldehyde 42. A slightly different series of