A concise synthesis of quinazolinone TGF-β RI inhibitor through one-pot three-component Suzuki–Miyaura/etherification and imidate–amide rearrangement reactions
A simple and efficient synthesis of dihydropyrrolopyrazole boronic acid intermediate ( 5) has been developed. Utilization of a three-component Suzuki–Miyaura/etherification with microwave heating led to advanced compound 11 in high yield and with easy purification. Reaction of compound 11 with metha...
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Published in | Tetrahedron Vol. 63; no. 47; pp. 11763 - 11770 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
OXFORD
Elsevier Ltd
19.11.2007
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | A simple and efficient synthesis of dihydropyrrolopyrazole boronic acid intermediate (
5) has been developed. Utilization of a three-component Suzuki–Miyaura/etherification with microwave heating led to advanced compound
11 in high yield and with easy purification. Reaction of compound
11 with methanesulfonyl chloride at room temperature furnished the 1,3
O–
N rearranged product (
12), which is postulated to proceed via an intramolecular mechanism. The outlined synthesis provides a highly efficient and high-yielding route that is amenable to rapid analog synthesis.
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ISSN: | 0040-4020 1464-5416 |
DOI: | 10.1016/j.tet.2007.08.069 |