A Novel Dilithiation Approach to 3,4-Dihydro-2<i>H</i>-1,3-benzothiazines, 3,4-Dihydro-2<i>H</i>-1,3-benzoxazines, and 2,3,4,5-Tetrahydro-1,3-benzothiazepines
作者:Alan R. Katritzky、Yong-Jiang Xu、Ritu Jain
DOI:10.1021/jo020176e
日期:2002.11.1
3,4-Dihydro-2H-1,3-benzothiazines 4, 3,4-dihydro-2H-1,3-benzoxazines 9, and 2,3,4,5-tetrahydro-1,3-benzothiazepines 6 were synthesized by directed ortho-lithiation of thiophenols and phenols and by side-chain lithiation of substituted thiophenols, respectively, in one-pot by reacting with N,N-bis[(benzotriazol-1-yl)methyl]amines 3 as 1,3-biselectrophile synthons.