A 2',3'-methano carbocyclic nucleoside, 9-(c-4-hydroxymethylbicyclo[3.1.0]h
ex-r-2-yl)-9H-adenine, has been efficiently synthesized from 2-azabicyclo[2
.2.1]hex-5-en-3-one(ABH) in six steps involving 1,3-dipolar cycloaddition,
photolysis, and adenine ring construction, (C) 1999 Elsevier Science Ltd. A
ll rights reserved.