The decalin derivatives 2 (92% ee) and 18c (92% ee) were synthesized from the corresponding prochiral substrates 7b and 17a by an asymmetric Heck reaction.
Stereocontrolled total synthesis of (±)hydroxy patchouli alcohol and the corresponding (±)-carboxylic acid, metabolites of patchouli alcohol, and (±)-norpatchoulenol
The first total synthesis of (±)-hydroxy patchoulialcohol (3) and the corresponding (±)-carboxylic acid 4, the biooxidation products of patchoulialcohol (2) has been achieved. (±)-Norpatchoulenol (1) has also been synthesized by the biogenetic route via 3 and 4.
Stereocontrolled total synthesis of (±)-norpatchoulenol and two metabolites of patchouli alcohol, (±)-hydroxy patchouli alcohol and the corresponding (±)-carboxylic acid
The first total synthesis of the two biooxidation products of patchoulialcohol (2), (±)-hydroxy patchoulialcohol (3) and the corresponding (±)-carboxylic acid 4, has been achieved in highly stereoconcrolled manners. Synthesis of (±)-norpatchoulenol (1), the real odoriferous substance of patchouli oil, has been accomplished by the biogenetic route via (±)-3 and (±)-4.
We report here on the construction of the ABC-ring framework of (+/-)-Taxol using an intramolecular aldol reaction as a key step. AB-ring compound 8 was converted to ketoaldehyde 25 as a precursor of an aldol reaction via introduction of oxygen-functionalities and a methoxycarbony] group, which can be converted to a methyl group, in the proper positions of the B-ring. An aldol reaction of ketoaldehyde with LDA led to the formation of the desired product 27, which corresponds to the ABC-ring framework of (+/-)-Taxol. (c) 2008 Elsevier Ltd. All rights reserved.