摘要:
An efficient method for the synthesis of a compound of formula (2) is disclosed which comprises reacting a 4-acyl-2-azetidinone with a titanium, zirconium or hafnium enolate of a 1-hydroxy-2-butanone derivative.
摘要:
A process for enhancing the purity of 2R-[1-hydroxy- 1-trifluoromethyl- 3-cyclopropylpropyn-2-yl] -4-chloroaniline comprising the formation of an acid addition salt which is capable of rejecting the racemate in the selected organic solvent.
摘要:
The instant invention relates to a compound of formula (I) wherein Ra and P are: (a) hydrogen, (b) methyl, or (c) a hydroxy protecting group and an efficient process for its synthesis.
摘要:
The present invention is directed to a novel process for the preparation of a spiroindoline sulfonamides of formula (I), wherein L is hydrogen or an amino protecting group. These compounds are useful in the preparation of certain spiro compounds which have the ability to stimulate the release of natural or endogeneous growth hormone. The spiro compounds may be used to treat conditions which require the stimulation of growth hormone production or secretion such as in humans with a deficiency of natural growth hormone or in animals used for food or wool production where the stimulation of growth hormone will result in a larger, more productive animal.