The oxirane ring openings of the dianhydro sugar with high regioselectivity and its use in preparation of two chiral segments of 6-deoxyerythronolide B
作者:Takeshi Wakamatsu、Hideo Nakamura、Yuji Nishikimi、Kaoru Yoshida、Tomoko Noda、Masato Taniguchi、Yoshio Ban
DOI:10.1016/s0040-4039(00)85401-5
日期:1986.1
The oxirane ring of the dianhydro sugar 2 obtained from levoglucosan (1,6-anhydro-β-D-glucose) is opened regioselectively with organometallic carbon nucleophiles and its application to an asymmetric synthesis of the C1–C5 segment 9 together with the C9-C15 unit 18 of 6-deoxyerythronolide B 1 is described.
A Study of Stereoselective Hydrolysis of Symmetrical Diesters with Pig Liver Esterase
作者:Peter Mohr、Nada Waespe-?ar?evi?、Christoph Tamm、Krystyna Gawronska、Jacek K. Gawronski
DOI:10.1002/hlca.19830660815
日期:1983.12.14
Pigliver esterase-(PLE) catalyzed hydrolysis of dimethyl esters of symmetrical dicarboxylic acids, including meso-diacids, cis-1,2-cycloalkanedicarboxylic acids, and diacids with a prochiral center, was studied with 14 substrates. The products of these stereoselective hydrolyses are chiral monoesters of dicarboxylic acids, with an enantiomeric excess (e.e.) from 10% to 100%. Some of these optically
Erythromycin. VIII. Structure of Dihydroerythronolide<sup>1</sup>
作者:Koert Gerzon、Edwin H. Flynn、Max V. Sigal、Paul F. Wiley、Rosemarie Monahan、U. Carol Quarck
DOI:10.1021/ja01605a027
日期:1956.12
Versatile, high 2,4-syn dialkyl diastereoselection in the radical debromination of α-bromo-α-methyl-δ-valerolactones with tri-n-butyltin hydride and a catalytic amount of triethylborane
作者:Syun-ichi Kiyooka、Yong-Nan Li、Kazi A Shahid、Momotoshi Okazaki、Yoshihiro Shuto
DOI:10.1016/s0040-4039(01)01507-6
日期:2001.10
An interesting 2,4-syn dialkyl diastereoselection has been observed in the radical debromination of alpha -bromo-alpha -methyl-delta -valerolactones. The reaction of 4-alkyl-2-bromo-3-hydroxy-2-methyl-5-pentanolides with Bu3SnH and a catalytic amount of Et3B gave, essentially, a single diastereomer with a 2,4-syn dialkyl relationship, independent of the orientation of the hydroxy Et substituent at C-3. (C) 2001 Elsevier Science Ltd. All rights reserved.
BORN, MARCO;TAMM, CHRISTOPH, TETRAHEDRON LETT., 30,(1989) N6, C. 2083-2086