Carbon–SO3H: a novel and recyclable solid acid catalyst for the synthesis of spiro[4H-pyran-3,3′-oxindoles]
作者:B. Maheshwar Rao、G. Niranjan Reddy、T. Vijaikumar Reddy、B.L.A. Prabhavathi Devi、R.B.N. Prasad、J.S. Yadav、B.V. Subba Reddy
DOI:10.1016/j.tetlet.2013.02.089
日期:2013.5
A bioglycerol derived carbon-sulfonic acid is found to catalyze efficiently the three-component one-pot condensation of isatin, malononitrile, and 1,3-dicarbonyls to afford a wide range of spiro[4H-pyran-3,3′-oxindole]derivatives in good yields and selectivity. The use of a recyclable solid acid catalyst makes this method simple, convenient, and cost-effective.
已发现生物甘油衍生的碳磺酸可有效催化伊斯丁,丙二腈和1,3-二羰基的三组分一锅缩合,从而提供广泛的螺[4H-吡喃-3,3'-羟吲哚]衍生物具有良好的产率和选择性。可循环使用的固体酸催化剂的使用使该方法简单,方便且具有成本效益。