A Synthesis of Aromatic Five- and Six-Membered B−N Heterocycles via Ring Closing Metathesis
摘要:
[GRAPHICS]The ring closing metathesis on appropriate vinyl or allyl aminoboranes (1 or 2) gives azaboracycloalkenes (3 or 4) which can be converted to azaborolides (5) or azaborines (6).
Diversity through Isosterism: The Case of Boron-Substituted 1,2-Dihydro-1,2-azaborines
作者:Adam J. V. Marwitz、Eric R. Abbey、Jesse T. Jenkins、Lev N. Zakharov、Shih-Yuan Liu
DOI:10.1021/ol702383u
日期:2007.11.1
The first general synthesis of boron-substituted 1,2-dihydro-1,2-azaborines is described. The versatile 1,2-dihydro-1,2-azaborine precursor 4 is synthesized through a ring-closing metathesis-oxidation sequence. Treatment of 4 with a wide range of anionic nucleophiles furnishes the desired adducts 5 in good yields. The scope includes hydrogen- and a variety of carbon- and heteroatom-based nucleophiles. Furthermore, the boron-containing isostere (7) of the potent hypolipidemic agent, methyl 2-ethylphenoxyacetate (8), is readily prepared through our method.