Diazo transfer adjacent to sulfoxides to form stable alpha-diazo-beta-oxo sulfoxides has been achieved in cyclic systems. (C) 1998 Elsevier Science Ltd. Ali rights reserved.
LiBr catalyzed solvent-free ring expansion of epoxides to 1,4-oxathian-2-ones with α-mercaptocarboxylic acids
作者:Atul K. Singh、Ankita Rai、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2011.05.010
日期:2011.7
An efficient and rapid (10–20 min) one-pot synthesis of chemically and pharmaceutically interesting 1,4-oxathian-2-ones is reported. The protocol involves LiBr catalyzed regioselective ring-opening–ring-closing reaction cascade of terminal epoxides with α-mercaptocarboxylic acids at rt under solvent-free conditions. Recycling of the catalyst, atom economy, and formation of water as the only by-product
Abstract A rapid one-pot reaction of epoxides with ethyl mercaptoacetate furnishing 1,4-oxathian-2-ones in the presence of a catalytic amount of eco-friendly triton B is reported. High regioselectivity is due to the nucleophilic attack on the less sterically hindered carbon atom of the aliphatic unsymmetrical epoxide.
摘要报道了在催化量的环保氚 B 存在下,环氧化物与巯基乙酸乙酯的快速一锅反应,提供 1,4-oxathian-2-ones。高区域选择性是由于对脂肪族不对称环氧化物的空间位阻较小的碳原子的亲核攻击。
Kennedy, Michael; McKervey, M. Anthony; Maguire, Anita R., Journal of the Chemical Society. Perkin transactions I, 1990, # 4, p. 1041 - 1045
作者:Kennedy, Michael、McKervey, M. Anthony、Maguire, Anita R.、Naughton, Sean
DOI:——
日期:——
Synthesis of α-diazo-β-oxo sulfoxides
作者:Anita R. Maguire、Patrick G. Kelleher、George Ferguson、John F. Gallagher
DOI:10.1016/s0040-4039(98)00255-x
日期:1998.4
Diazo transfer adjacent to sulfoxides to form stable alpha-diazo-beta-oxo sulfoxides has been achieved in cyclic systems. (C) 1998 Elsevier Science Ltd. Ali rights reserved.
KOSKIMIES, J. K., ACTA CHEM. SCAND., 1984, 38, N 2, 101-108