66967-01-9Relevant articles and documents
Strict reagent control in the asymmetric allylboration of N-TIPS-α-amino aldehydes with the B-allyl-10-TMS-9-borabicyclo[3.3.2] decanes
Soto-Cairoli, Buddy,Soderquist, John A.
supporting information; experimental part, p. 401 - 404 (2009/07/04)
(Chemical Equation Presented) The allylboration of enantiomerically pure N-triisopropylsilyl-α-amino aldehydes (2) with B-allyl-10-trimethylsilyl- 9-borabicyclo[3.3.2]decanes (1) proceeds cleanly at -78 °C, exhibiting essentially complete reagent control. After an oxidative workup, an HOAc-mediated N→O TIPS rearrangement facilitates the clean formation of stable O-TIPS protected β-amino alcohol derivatives 3 which are isolated in 60-83% yields in >96% de and >99% ee. For the leucinal series (R = i-Bu), an efficient entry to either statine (8aSS) or epi-statine (8aRS) is reported illustrating the versatility of this potent 1/2 combination.
Intramolecular nucleophilic epoxidation of γ-amino-α,β- unsaturated esters with an N-hydroperoxymethyl group
Yoo, Dongwon,Kim, Hyeonjeong,Kim, Young Gyu
, p. 1707 - 1710 (2007/10/03)
Intramolecular nucleophilic epoxidation reactions of γ-amino-α, β-unsaturated esters have been studied for the first time with a hydroperoxymethyl group attached to the nitrogen atom. The epoxidation was fast under mild basic conditions and highly anti se
A synthetic approach to 3-hydroxy 4-substituted carboxylic acids based on the stereoselective reduction of 1-trimethylsilyl-1-alkyn-3-ones
Alemany, Carme,Bach, Jordi,Garcia, Jordi,López, Marta,Rodríguez, Ana B.
, p. 9305 - 9312 (2007/10/03)
The oxazaborolidine-mediated reduction of chiral, 4-substituted 1-trimethylsilyl-1-alkyn-3-ones followed by hydroboration affords syn or anti 3-hydroxy 4-substituted carboxylic acids, common substructures of a number of biologically active macrolides, peptides and depsipeptides, with high control on the new C(3) stereocenter. This strategy has been applied to the synthesis of (3S,4S)-3-hydroxy-4-methylheptanoic acid and of N-Boc-statine, constituents of permentin A and pepstatin, respectively. (C) 2000 Elsevier Science Ltd.