The preparation of eighteen epoxy diazomethyl ketones 1 is described. Two general methods were developed. Firstly, treatment of the mixed anhydrides of glycidic acids and carbonic acid ester with diazomethane led to the title compounds in yields ranging from 17–74%. Secondly, glycidyl chlorides which were obtained from sodium glycidates and oxalyl chloride, gave the desired products upon treatment
Synthetic studies towards Leinamycin. A concise synthesis of the spiro-fused 1,3-Dioxo-1,2-dithiolane moiety.
作者:Gerald Pattenden、Anthony J. Shuker
DOI:10.1016/0040-4039(91)80239-3
日期:1991.11
A synthesis of the 1,3-dioxo-1,2-dithiolabne residue (2) found in the antitumour antibiotic substance leinamycin (1) is described which features: (i) elaboration of the thiolactone (5), followed by (ii) ring opening to the thioacid (9) using H2S-Et3N and (iii) ring closure of (9) to (4) in the presence of aq. FeCl3, and finally (iv) oxidation (Scheme 1). 30071991