期刊
TETRAHEDRON
卷 60, 期 31, 页码 6619-6627出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2004.05.090
关键词
phosphorus heterocycles; stereoselection; theoretical studies; conformation
A series of 3-phosphinoxido-and 3-phosphono-1,2,3,6-tetrahydrophosphinine oxides was synthesized by the diastereoselective addition of diphenylphosphine oxide and dialkyl phosphites to the alpha,beta-double-bond of 1,2-dihydrophosphinine oxides. Further refunctionalizations led to a 3-P(O)(OH)(2) derivative and to a disulfide. The conformation of the products was evaluated using the B3LYP/6-31+G*//B3LYP/3-21G* method, validated by calculation for a simple tetrahydrophosphinine oxide with a known stereostructure. The preferred conformers of the 3-P(X)Z(2)-tetrahydrophosphinine derivatives were among the twist-boat forms containing the exocyclic P-function in the axial position due to three kinds of favorable intramolecular interactions. Only the 3-P(O)(OH)(2) derivative was found to adopt a half-chair conformation as a consequence of intramolecular H-bonding. (C) 2004 Elsevier Ltd. All rights reserved.
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