Vinylmercurials react readily with allylic halides, lithium chloride and palladium chloride in tetrahydrofuran to give 1,4-dienes. Some reactions proceed well using only catalytic amounts of palladium chloride while others require stoichiometric amounts. The yields decrease with increasing substitution about the carboncarbon double bond of the allylic halide. The reactions appear to proceed through
Mercury in organic chemistry. 20. Alkylation of organomercurials via organocopper reagents
作者:R.C. Larock、D.R. Leach
DOI:10.1016/s0040-4039(01)81925-0
日期:1981.1
Aryl-, alkenyl-, and alkylmercurials readily cross-couple with primary and secondary alkyl- and alkenylcuprate reagents to provide the first truly general method for the alkylation of a wide variety of organomercurials.
3-(Optionally oxygenated)-5-oxocyclopent-1-enealkanoic acids and their alkyl esters are allowed to react with appropriate alkenyl copper, alkenyl boron, alkynyl boron, alkynyl gallium or alkynyl aluminum compounds to produce the corresponding 2-(3-hydroxy-3-[optionally alkylated]-1-alkenyl)cyclopentanealkanoic acids, 2-(3-hydroxy-3-[optionally alkylated]-1-alkynyl)cyclopentanealkanoic acids and their esters. The prostaglandin derivatives so produced are valuable and useful as pharmacological agents as is evidenced by their central nervous system-affective, anti-bacterial, anti-fungal and prostaglandin antagonist activity.
2-Alkoxy-4-hydroxy-5-oxocyclopent-1-eneheptanoic acid and its lower alkyl esters are reduced with metallic hydrides to yield the corresponding 3-hydroxy-5-oxo-cyclopent-1-eneheptanoic acid and its esters. The latter compounds are valuable intermediates in the preparation of pharmacologically active prostaglandin derivatives.