𝔖 Bobbio Scriptorium
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Organocatalysis “on Water”. Regioselective [3 + 2]-Cycloaddition of Nitrones and Allenolates.

✍ Scribed by David Gonzalez-Cruz; David Tejedor; Pedro de Armas; Ezequiel Q. Morales; Fernando Garcia-Tellado


Book ID
101994862
Publisher
John Wiley and Sons
Year
2006
Weight
21 KB
Volume
37
Category
Article
ISSN
0931-7597

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## Abstract Reaction of 3‐thioxoandrosta‐1,4‐dien‐17‐one (1) with the diazo compounds 2a–i affords 4′‐substituted spiro[17‐oxoandrosta‐1,4‐diene‐3,2′‐[1,3,4]thiadiazolines], which undergo a two‐step ring contraction with extrusion of nitrogen and sulfur, leading to the substituted 3‐methylen‐ and 3