Diastereoselective Aziridination of 2-B(pin)-Substituted Allylic Alcohols: An Efficient Approach to Novel Organoboron Compounds
摘要:
We report that 2-B(pin)-substituted allylic alcohols are good substrates for diastereoselective aziridinations in the presence of Phl(OAc)(2) and N-aminophthalimide. Under the aziridination conditions, the valuable B-C bond remains Intact, affording a variety of novel boron-substituted aziridines In good yields and excellent diastereoselectivities. Oxidation of the aziridine B-C bond enables generation of syn-1,3-aminohydroxy-2-ketones with high diastereoselectivity.
Diastereoselective Aziridination of 2-B(pin)-Substituted Allylic Alcohols: An Efficient Approach to Novel Organoboron Compounds
摘要:
We report that 2-B(pin)-substituted allylic alcohols are good substrates for diastereoselective aziridinations in the presence of Phl(OAc)(2) and N-aminophthalimide. Under the aziridination conditions, the valuable B-C bond remains Intact, affording a variety of novel boron-substituted aziridines In good yields and excellent diastereoselectivities. Oxidation of the aziridine B-C bond enables generation of syn-1,3-aminohydroxy-2-ketones with high diastereoselectivity.
(Bpin)2 as the boron reagent in dimethyl sulfoxide at room temperature. Both terminal and internal propargyl alcohols with diverse structures and functional groups underwent the transformation smoothly to produce β-Bpin-substituted (E)-allylic alcohols, of which the synthetic potentials were demonstrated by the downstream conversions of boronate, alkenyl, and hydroxylgroups.