Stereoselective Synthesis of Highly Susbstituted Tetrahydrofurans
作者:Tushar K. Chakraborty、Sanjib Das、T. Venugopal Raju
DOI:10.1021/jo010131y
日期:2001.6.1
Synthesis of chiral 1,3-diols by radical-mediated regioselective opening of 2,3-epoxy alcohols using cp2TiCl
作者:Tushar K Chakraborty、Sanjib Das
DOI:10.1016/s0040-4039(02)00241-1
日期:2002.3
Radical-mediated opening of chiral 2,3-epoxy alcohols la-e, regioselectively at the 2-position, using cp(2)TiCl in the absence of a hydrogen source leads to the formation of the 1,3-diols 2a-e. (C) 2002 Published by Elsevier Science Ltd.
Regioselective Alkyl and Alkynyl Substitution Reactions of Epoxy Alcohols by the Use of Organoaluminum Ate Complexes: Regiochemical Reversal of Nucleophilic Substitution Reactions
作者:Minoru Sasaki、Keiji Tanino、Masaaki Miyashita
DOI:10.1021/ol010062+
日期:2001.5.1
Unprecedented nucleophilic substitution reactions of 2,3-epoxy-1-alkanols with alkyl and alkynylaluminum ate complexes have been studied and demonstrated to occur at the C2 position with extremely high stereoselectivity, i.e., with exactly reversed regioselectivity to that obtained in the substitution reactions by normal organoaluminum reagents, resulting in the formation of the C2-alkyl and C2-alkynyl substitution products in excellent yields.
Chakraborty, Tushar K.; Dutta, Shantanu, Journal of the Chemical Society. Perkin transactions I, 1997, # 9, p. 1257 - 1259
作者:Chakraborty, Tushar K.、Dutta, Shantanu
DOI:——
日期:——
Synthetic Studies toward Potent Cytotoxic Agents Amphidinolides: Synthesis of the C<sub>1</sub>-C<sub>6</sub>and C<sub>9</sub>-C<sub>17</sub>Moieties of Amphidinolides O and P
作者:T. K. Chakraborty、Sanjib Das
DOI:10.1246/cl.2000.80
日期:2000.1
Stereoselective synthesis of the (4R)-C1-C6 and (14R, 15R)-C9-C17 segments, 4 and 5 respectively, of amphidinolides O and P have been achieved starting from a common chiral precursor 6 which was obtained by radical-mediated opening of a trisubstituted epoxy alcohol using Cp2TiCl-cyclohexa-1,4-diene.
两栖类内酯 O 和 P 的 (4R)-C1-C6 和 (14R, 15R)-C9-C17 片段分别为 4 和 5 的立体选择性合成是从通过自由基介导获得的共同手性前体 6 开始实现的使用 Cp2TiCl-环己-1,4-二烯打开三取代环氧醇。