Process for the preparation of aryl-, heteroaryl-, or cycloalkyl

Details Process for the preparation of aryl-, heteroaryl-, or cycloalkyl Process for the preparation of aryl-, heteroaryl-, or cycloalkyl

1991-01-25

1992-06-30

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 9, 560 24, 560 25, 560 28, 560 29, 560 32, 560115, 560345, C07C26900, C07C27116, C07C26102

Patent

active

051264765

ABSTRACT:
A process for making aryl-, heteroaryl-, or cycloalkyl-substituted alkyl urethanes is disclosed. The urethanes are prepared by electrophilic carbamylation of aromatic compounds with alkylene bis(carbamic acid esters) or the equivalent in the presence of an acidic catalyst and a polar aprotic solvent. The alkyl urethanes may be cracked to give the corresponding substituted alkyl isocyanates.

REFERENCES:
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patent: 4570012 (1986-02-01), Singh et al.
patent: 4871871 (1989-10-01), Shawh et al.
patent: 4873364 (1989-10-01), Shawh et al.
patent: 4879410 (1989-11-01), Singh et al.
patent: 4883908 (1989-11-01), Shawh et al.
Krow et al J. Chem. Eng. Data, 17, p. 116 (1972).
Wilkens (Tetrahedron Letters (1965) 4817).
Murphy et al. (J. Chem. Soc., Perkin Trans. I (1981) 447).

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