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cis- and trans-2-(Isocyanomethyl)-5,5-dimethyl-2-oxo-4-phenyl-1,3,2-dioxaphosphorinane – Synthesis and Structure of the First Chiral Isocyanomethylphosphonate Synthons

✍ Scribed by Jan-Willem Weener; Jos P. G. Versleijen; Auke Meetsma; Wolter ten Hoeve; Albert M. van Leusen

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 320 KB
Volume: 1998
Category: Article
ISSN: 1434-193X
DOI: 10.1002/(sici)1099-0690(199808)1998:8<1511::aid-ejoc1511>3.0.co;2-g

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✦ Synopsis

Both cis-2-(isocyanomethyl)-5,5-dimethyl-2-oxo-4-phenyl-upon dehydration gave 1a. Thus, both (±)-1a and (2S,4S)-(Ϫ)-1a were prepared, and their molecular structures were 1,3,2-dioxaphosphorinane (1a) and the trans epimer 1b have been prepared as potentially useful chiral isocyano-determined by single-crystal X-ray analysis. Treatment of (2S,4S)-(-)-1a with KF gave a 1:3 equilibrium mixture of the methylphosphonate synthons. 2-Methoxy-1,3,2-dioxaphosphorinanes 5 and the corresponding 2-ethoxy analog 6 were phosphorus epimers 1a and 1b, from which the predominant trans epimer (2S,4R)-(-)-1b was isolated by column prepared from 2,2-dimethyl-1-phenyl-1,3-propanediol (2) and were converted in an Arbuzov-type reaction to 2-chromatography and crystallization. (formamidomethyl)oxo-1,3,2-dioxaphosphorinane 7, which

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