Alexanian, Heterocycles 2, 595( 1974). Wassenaar, Tetrahedron Lett. Scheffer, Justus Liebigs Ann. BCrohnke, Justus Liebigs Ann. Tremper, Tetrahedron Lett 29( 1974); J. 94, 1395( 1972); 95, 1945 and 1954( 1973).
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