Metallation reactions. XXVI. α,α′-Dimetallation of 1,2-bis(methylthiobenzene)
摘要:
alpha,alpha'-Dimetallation of bis(methylthio)benzene (1) with butyllithium or with superbases gives 2 with good yield. This species allows the simultaneous introduction of two electrophiles in thiomethyl groups. Alternatively it was possible to functionalize these groups with two different electrophiles by two successive one-flask monometallations. Compound 2 rise to gives heterocyclic compounds. (C) 1999 Elsevier Science Ltd. All rights reserved.
An unusual reaction of Lawesson's reagent with 1,8-diketones: A synthesis of fused 1,4-dithiins and thiophenes
作者:Turan Ozturk
DOI:10.1016/0040-4039(96)00396-6
日期:1996.4
Reaction of 1,8-diketones 3 with Lawesson'sreagent 8 resulted in the formation of five and six-membered rings 5–7, 18, depending on the nature of the substituents. Product 6 is converted in two steps to the unsymmetric ‘ET’ analogue 20, containing an extra double bond.
Metallation reactions. XXVI. α,α′-Dimetallation of 1,2-bis(methylthiobenzene)
作者:M.G. Cabiddu、S. Cabiddu、E. Cadoni、S. De Montis、C. Fattuoni、S. Melis、F. Sotgiu
DOI:10.1016/s0040-4020(99)00873-x
日期:1999.12
alpha,alpha'-Dimetallation of bis(methylthio)benzene (1) with butyllithium or with superbases gives 2 with good yield. This species allows the simultaneous introduction of two electrophiles in thiomethyl groups. Alternatively it was possible to functionalize these groups with two different electrophiles by two successive one-flask monometallations. Compound 2 rise to gives heterocyclic compounds. (C) 1999 Elsevier Science Ltd. All rights reserved.