作者:Guojin Wang、Yu Tang、Yu Zhang、Xiaohua Liu、Lili Lin、Xiaoming Feng
DOI:10.1002/chem.201605127
日期:2017.1.12
An enantioselective sulfa‐Michael‐cyclization reaction was developed for the synthesis of 1,5‐benzothiazepines with versatile pharmacological activities. The reaction between 2‐aminothiophenol and α,β‐unsaturated pyrazoleamides gave direct access to N−H‐free 1,5‐benzothiazepines in the presence of a chiral N,N′‐dioxide/Yb(OTf)3 complex. Excellent enantioselectivities (up to 96 % ee) and high yields
开发了一种对映选择性磺胺-迈克尔环化反应,用于合成具有多种药理活性的1,5-苯并硫氮杂s。在手性N,N'-二氧化物/ Yb(OTf)3络合物的存在下,2-氨基苯硫酚与α,β-不饱和吡唑酰胺之间的反应可直接获得不含NH的1,5-苯并噻嗪类。在温和的反应条件下,对于多种底物,均具有出色的对映选择性(最高ee达96%)和高产率(最高99%)。该方法为抗抑郁药(R)-(-)-噻嗪酮提供了一种简便的方法。