A versatile synthesis of 9-BBN derivatives from organometallic reagents and 9-(triisopropylsilyl)thio-9-borabicyclo[3.3.1]nonane
摘要:
Representative B-substituted-9-BBNs (3) are efficiently prepared from either organolithium or Grignard reagents through their addition to (TIPS)S-9-BBN (1) which is readily available from TIPSSH and 9-BBN-H. The thermally induced collapse of the intermediate 'ate' complexes (2) produces 3 which is easily isolated in good yield and high purity. (C) 2000 Elsevier Science Ltd. All rights reserved.
Free-Radical Reactions of Trialkylboranes with β-Nitrostyrenes To Generate Alkenes
作者:Ching-Fa Yao、Cheng-Ming Chu、Ju-Tsung Liu
DOI:10.1021/jo9716901
日期:1998.2.1
beta-Nitrostyrenes 1 react with trialkylboranes under a nitrogen atmosphere to generate high yields of alkenes 2. The mechanism is proposed to be a free-radical reaction via NO(2)/alkyl substitution since the reaction is stimulated by the presence of a trace of oxygen in the nitrogen or tert-butyl peroxide or by photolysis and is retarded or inhibited by the addition of galvinoxyl to the solution.
The novel benzopyran class of selective cyclooxygenase-2 inhibitors. Part 2: The second clinical candidate having a shorter and favorable human half-life
作者:Jane L. Wang、David Limburg、Matthew J. Graneto、John Springer、Joseph Rogier Bruce Hamper、Subo Liao、Jennifer L. Pawlitz、Ravi G. Kurumbail、Timothy Maziasz、John J. Talley、James R. Kiefer、Jeffery Carter
DOI:10.1016/j.bmcl.2010.07.054
日期:2010.12
In this Letter, we provide the structure-activity relationships, optimization of design, testing criteria, and human half-life data for a series of selective COX-2 inhibitors. During the course of our structure-based drug design efforts, we discovered two distinct binding modes within the COX-2 active site for differently substituted members of this class. The challenge of a undesirably long human half-life for the first clinical candidate 1 t(1/2) = 360 h was addressed by multiple strategies, leading to the discovery of 29b-(S) (SC-75416) with t(1/2) = 34 h. (C) 2010 Elsevier Ltd. All rights reserved.
Solid-phase synthesis of unnatural α-amino acid derivatives using a resin-bound glycine cation equivalent
作者:Martin J. O'Donnell、Francisca Delgado、Mark D. Drew、Richard S. Pottorf、Changyou Zhou、William L. Scott
DOI:10.1016/s0040-4039(99)01101-6
日期:1999.8
Unnatural amino acids were synthesized on solid-phase by reaction of a resin-bound Schiff base with organoboranes. This novel use of a resin-bound glycine cation equivalent allows for the preparation of a variety of amino acid structural types not readily available by the complementary anionic equivalent. (C) 1999 Elsevier Science Ltd. All rights reserved.
Katz,J.-J. et al., Bulletin de la Societe Chimique de France, 1977, p. 683 - 687