Asymmetric Synthesis of the ABC-Ring System of the Antitumor Antibiotic MPC1001
作者:Jianbiao Peng、Derrick L. J. Clive
DOI:10.1021/jo802344t
日期:2009.1.16
trans-4-Hydroxy-L-proline was converted into a tricyclic compound representing three contiguous rings of the anticancer antibiotic MPC1001. The tricyclic model contains the dihydrooxepin and diketopiperazine Subunits, as well as one of the Sulfur atoms of the natural product. The diketopiperazine unit was formed by a new method that involves cyclization of an enolate onto the carbonyl of a phenyl carbamate, and the dihydrooxepin ring was generated by using an acid-induced cyclization of an alcohol onto the beta-carbon of a vinylogous amide.
Oxidative fragmentations of selected 1-alkenyl sulfoxides. Chemical and spectroscopic evidence for 1-alkenesulfinyl chlorides
作者:Adrian L. Schwan、Mark L. Kalin、Kristin E. Vajda、Ting-Jian Xiang、Denis Brillon
DOI:10.1016/0040-4039(96)00281-x
日期:1996.4
A collection of 1-alkenyl sulfoxides possessing diphenylmethyl, p-methoxybenzyl or 2-(trimethylsilyl)ethyl groups can be converted to 1-alkenesulfinyl chlorides using SO2Cl2. The 1-alkenesulfinyl chlorides were spectroscopically characterized by IR and were chemically captured as their cyclohexyl or 3-phenylpropyl 1-alkenesulfinate esters. Copyright (C) 1996 Elsevier Science Ltd