Stereoselective bidirectional synthesis of spiroacetals via Rh(II)-catalysed double C–H insertion
作者:Romain J. Lepage、Mark J. Coster
DOI:10.1016/j.tet.2018.01.043
日期:2018.3
Rh(II)-catalysed double C–H insertion of methylene acetals bearing two diazo ester substituents is described. The diastereoselectivity of this bidirectional approach can be tuned through appropriate choice of catalyst, and chiral catalysts lead to products with up to 89% ee. The diastereoselectivity of the first cyclisation suggests that the second cyclisation proceeds via a non-concerted pathway.
作者:E. Emmet Reid、Leonard M. Rice、Charles H. Grogan
DOI:10.1021/ja01626a048
日期:1955.11
Synthesis of 5-Alkyl-6-arylmethyl-2-(7-bromo-3,5-dioxaheptylthio)-pyrimidin-4(1H)-ones and 7-Oxopyrimidino-1,5,3-oxathiazepines as NewS-DABO Analogues with Anti-HIV Activity
作者:Ole S. Pedersen、Lene Petersen、Malene Brandt、Claus Nielsen、Erik B. Pedersen
DOI:10.1007/s007060050310
日期:1999.12
New S-DABOs with a long alkylating S-alkyl substituent showing antiretroviral activity against HIV-1 in the micromolar range were prepared from 5,6-disubstituted 4-oxo-2-thiopyrimidines and 1,7-dibromo-3,5-dioxaheptane. The analogues with an ethyl group in position 5 also showed activity in the micromolar range against a Tyr/8/Cys mutant strain of HIV-1. The S-DABO analogues showing activity against the HIV-1 RT mutant strain were transformed to the N-3 and N-1 ring closed 7-oxo-pyrimidino-1,3,5-oxathiazepines which surprisingly all showed activity against HIV-1 in the micromolar range, as well as against a Tyr/8/Cys mutant strain of HIV-1. Some analogues of S-DABO with a thien-7-ylmethyl residue in position 6 were synthesized and tested against HIV-1 wild type, hut they showed less or comparable activities to those of the corresponding 6-benzyl analogues.
THE PREPARATION AND RELATIVE REACTIVITIES OF MANY-MEMBERED CYCLIC DISULFIDES
作者:J. G. AFFLECK、GREGG DOUGHERTY
DOI:10.1021/jo01150a024
日期:1950.7
Oxaalkane bisphosphonium compounds and the manufacture thereof