Formation of an unexpected rearrangement product using Grubbs’ second generation catalyst: 2-allyl-3,4-dihydro-2H-1,4-benzothiazines from diene precursors
作者:Garreth L. Morgans、Dharmendra B. Yadav、Manuel A. Fernandes、Charles B. de Koning、Joseph P. Michael、Willem A.L. van Otterlo
DOI:10.1016/j.tetlet.2012.02.109
日期:2012.5
6-dihydro-2H-1,6-benzothiazocine, as well as the unexpected 2-allyl-4-[(4-methylphenyl)sulfonyl]-3,4-dihydro-2H-1,4-benzothiazine. Use of similar conditions on an analogous sulfoxide resulted in the expected product, 6-[(4-methylphenyl)sulfonyl]-5,6-dihydro-2H-1,6-benzothiazocine 1-oxide, indicating that the sulfide was playing a key role in this novel transformation. Furthermore, the use of N-allyl-4-methyl-
将亚化学计量的Grubbs第二代催化剂应用于底物N-烯丙基-N- [2-(烯丙基硫烷基)苯基] -4-甲基苯磺酰胺,得到闭环化合物6-[(4-甲基苯基)磺酰基]- 5,6-二氢-2 H -1,6-苯并噻唑啉,以及意想不到的2-烯丙基-4-[(4-甲基苯基)磺酰基] -3,4-二氢-2 H -1,4-苯并噻嗪。在类似的亚砜上使用相似的条件,得到了预期的产物6-[[(4-甲基苯基)磺酰基] -5,6-二氢-2 H -1,6-苯并噻唑啉-1-氧化物,表明该硫化物正在发挥在这种新颖转变中的关键作用。此外,使用N-烯丙基-4-甲基-N-2-[((2-甲基-2-丙烯基)硫烷基]苯基}-苯磺酰胺在相同反应中得到2-(2-甲基-2-丙烯基)-3,4-二氢-2 H -1,4-苯并噻嗪。