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Serendipitous Observation of Liquid‐Phase Size Selectivity inside a Mesoporous Silica Nanoreactor in the Reaction of Chromene with Formic Acid
Author(s) -
Das Paramita,
Ray Suman,
Bhanja Piyali,
Bhaumik Asim,
Mukhopadhyay Chhanda
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201701975
Subject(s) - selectivity , nanoreactor , decarboxylation , formic acid , chemistry , enol , hydrolysis , combinatorial chemistry , organic chemistry , catalysis
An unprecedented product shape/size selectivity in the hydrolysis/decarboxylation reaction sequences of chromene with formic acid within MCM‐41 as a nanoreactor in the liquid phase is observed. Chromene is expected to form pyrimidine in the reaction with HCOOH. However, here, serendipitously, the product switches from pyrimidine to enol lactones and δ ‐keto acids inside the nanoreactor. The shape/size selectivity in the liquid phase is a highly desired phenomenon in organic synthesis. We prepared four different varieties of porous silica materials to obtain this product selectivity. Very high yields of these biologically relevant compounds surpass that achieved by existing methodologies. Again, though there are few reports of coumarin‐fused enol lactones, this approach enables the easy synthesis of naphthalene‐fused enol lactones. Moreover, this is the first generalized synthesis of δ ‐keto acids following a number of hydrolysis/decarboxylation/ring opening/tautomerization/decarboxylation steps.