Abstract

Herein, a new, bio-mass derived sustainable feedstock was employed for the synthesis of 4H-pyran derivatives. In context of this, water extract of tamarindus indica seed ash (WETSA) has been proven as a reaction media for one-pot three-component reaction between C−H activated carbonyl compound, aryl aldehyde, and malononitrile which acts as a basic catalyst. This novel method offers several advantages such as simple work-up, excellent yield, short reaction time, green reaction conditions, and the reaction even proceeds smoothly without any external promoter. The catalyst was recycled up to four times without significant loss in catalytic activity.

中文翻译：

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罗望子种子灰的水提取物：用于一锅三组分合成 4H-吡喃衍生物的农业废弃物绿色培养基

摘要

在此，一种新的生物质衍生的可持续原料被用于合成 4 H-吡喃衍生物。在此背景下，罗望子种子灰水提取物( WETSA) 已被证明可作为 C-H 活性羰基化合物、芳基醛和作为碱性催化剂的丙二腈之间的一锅三组分反应的反应介质。该方法具有后处理简单、收率高、反应时间短、反应条件绿色、反应平稳等优点，无需任何外加促进剂。催化剂循环使用多达四次，催化活性没有显着损失。