New lactone synthesis using a chromium carbene complex
作者:Taro Ishibashi、Nagisa Ochifuji、Miwako Mori
DOI:10.1016/0040-4039(96)01338-x
日期:1996.8
A new lactone synthesis was developed using the Fischer chromiumcarbenecomplex. The lactone was formed from an alkyne bearing a hydroxyl or silyloxyl group in a tether, along with carbene carbon and carbon monoxide of the chromiumcarbenecomplex. Using this procedure, (+)-blastmycinone and (+)-antimycinone were synthesized from (S)-ethyl lactate in short steps.
Vinylogous N-acyliminium ion cyclizations: application to the synthesis of depentylperhydrogephyrotoxin
作者:David J. Hart
DOI:10.1021/jo00315a027
日期:1981.1
Ye, Longwu; Cui, Li; Zhang, Guozhu, Journal of the American Chemical Society, 2010, vol. 132, p. 3258 - 3259
作者:Ye, Longwu、Cui, Li、Zhang, Guozhu、Zhang, Liming
DOI:——
日期:——
Palladium-catalyzed cyclocarbonylation of acetylenic alcohols to methylene lactones. Scope and synthesis of appropriate substrates
作者:Timothy F. Murray、Edward G. Samsel、Vijaya Varma、Jack R. Norton
DOI:10.1021/ja00415a020
日期:1981.12
The First Radical Method for the Introduction of an Ethynyl Group Using a Silicon Tether and Its Application to the Synthesis of 2‘-Deoxy-2‘-<i>C</i>-ethynylnucleosides<sup>1</sup>
A novel radical method for the stereoselective introduction of an ethynyl group has been developed. When a solution of ethynyldimethylsilyl (EDMS) or [2-(trimethylsilyl)ethynyl]dimethylsilyl (TEDMS) ethers of trans-2-iodoindanol was treated with Et3B followed by tetrabutylammonium fluoride in toluene, atom transfer 5-exo-cyclization and subsequent elimination occurred to give cis-2-ethynylindanol in high yield. The method was shown to be useful in the introduction of an ethynyl group in various five- and six-membered-ring iodohydrins. Furthermore, 2'-deoxy-2'-C-ethynyl-uridine (6) and -cytidine (7), which were designed as novel antimetabolites, were readily synthesized by using this method as the key step. This would be the first example in which a radical reaction was used for introducing an ethynyl group.