Formal [3+2] cycloadditions of 5-alkoxyfuran-2(5H)-ones 1 and 2 with allenylsulfones 3–5, promoted by different nucleophiles, afford 3-alkoxy-5-arylsulfonyl-3,3 a,6,6 a-tetrahydro-1H-cyclopenta[c]furan-1-ones in good yields with complete control of both regio- and π-facial...
cycloadditionfullerenesrare earthsregioselectivityX-ray diffractionAdditions of adamantylidene (Ad) to M 3 N@I h -C 80 (M=Sc, Lu) and Sc 3 N@D 5h -C 80 have been accomplished by photochemical reactions with 2-adamantyl-2,3'-[3H]-diazirine (1). In M 3 N@I h -C 80 , the ...
A尾-d-glucosidase inhibitor, cyclophellitol [(1S,2R,3S,4R,5R,6R)-5-hydroxymethyl-7-oxabicyclo[4.1.0]heptane-2,3,4-triol, 1] and its epoxide diastereomer, 1,6-epicyclophellitol (2) have been synthesized by using an intramolecular [3+2]-cycloaddition of a nitrile oxide to an alkene...