A novel stereoselective synthesis of the macrocycle of haem d1 that establishes its absolute configuration as 2R,7R
作者:Jason Micklefield、Richard L. Mackman、Christopher J. Aucken、Marion Beckmann、Michael H. Block、Finian J. Leeper、Alan R. Battersby
DOI:10.1039/c39930000275
日期:——
A novel route to isobacteriochlorins is developed that allows the stereoselective synthesis of the macrocycle of haem d1 and so establishes its absolute configuration 2R,7R.
Stereoselective reactions. 14. Efficient enantioselective construction of quaternary carbon centers by the sequential dialkylation of (S)-.gamma.-[(trityloxy)methyl]-.gamma.-butyrolactone. Synthesis of optically active .beta.,.beta.-disubstituted .gamma.-butyrolactones
作者:Kiyoshi Tomioka、Youn Sang Cho、Fuminori Sato、Kenji Koga
DOI:10.1021/jo00252a039
日期:1988.8
TOMIOKA, KIYOSHI;CHO, YOUN-SANG;SATO, FUMINORI;KOGA, KENJI, J. ORG. CHEM., 53,(1988) N 17, 4020
HIGHLY STEREOSELECTIVE CONSTRUCTION OF CHIRAL QUATERNARY CARBON: ASYMMETRIC SYNTHESIS OF β,β-DISUBSTITUTED γ-BUTYROLACTONES
作者:Kiyoshi Tomioka、Youn-Sang Cho、Fuminori Sato、Kenji Koga
DOI:10.1246/cl.1981.1621
日期:1981.11.5
Asymmetric synthesis of β, β-disubstituted γ-butyrolactones was carried out in highlystereoselective and predictable way, by means of sequential dialkylation of (S) -γ-trityloxymethyl-γ-butyrolactone followed by lactone carbonyl transposition. Application to the synthesis of spirocyclic compound was also described.
β, β-二取代 γ-丁内酯的不对称合成以高度立体选择性和可预测的方式进行,通过 (S) -γ-三苯甲基氧基甲基-γ-丁内酯的顺序二烷基化,然后内酯羰基转位。还描述了在合成螺环化合物中的应用。
Haem d1: development of a new coupling procedure leading to the synthesis of isobacteriochlorins 1
作者:Richard L. Mackman、Jason Micklefield、Michael H. Block、Finian J. Leeper、Alan R. Battersby
DOI:10.1039/a700654c
日期:——
A new approach has been developed for construction of the western
and eastern lactams, e.g. 2 and 3, needed for synthesis of
isobacteriochlorins. It involves acylation of pyrroles with lactonic
acids to form ketones. These are then efficiently converted into the
desired lactams by a short sequence of reactions. All the steps are high
yielding and simple to carry out.