February 10, 2018

Ashutosh Kar's Advanced Practical Medicinal Chemistry PDF

By Ashutosh Kar

ISBN-10: 8122425534

ISBN-13: 9788122425536

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Additional resources for Advanced Practical Medicinal Chemistry

Sample text

The Organic Chemistry of Drug Synthesis’, John Wiley and Sons, New York, 1995. 9. , Whitehouse Station, NJ, 12th, edn, 1996. 10. Jerry March, ‘Advanced Organic Chemistry’, John Wiley & Sons, Brisbane, 4th, edn, 1992. 1. INTRODUCTION It is indeed of paramount importance to be absolutely certain of the results of a particular experimental procedure. , the actual syntheses of a host of medicinally active pharmaceutical substances otherwise referred to as ‘drugs’ in the present text. However, while ‘performing the reactions’ to arrive at the final desired medicinal compound one has to take into consideration a large number of specific real experimental conditions, equipments, procedures with a common prevalent objective in mind which is to obtain the ‘maximum yield’ together with the ‘highest purity’ of the synthesized ‘drug’.

Explanation. An aldehyde or a carboxylic acid undergoes reduction to give rise to an ALCOHOL. The resulting alcohol finally yields RCH2—H by two different ways, namely : (a) By reduction with LiAlH4, and (b) By interaction with either HX or PX3 into the corresponding alkyl halide which on further reaction with pure dry magnesium ribbon in diethyl ether generates the alkyl magnesium halide. , R—CH2—H. P-IV\C:\N-ADV\CH2-1 32 ADVANCED PRACTICAL MEDICINAL CHEMISTRY Nevertheless, the alcohol (RCH2—OH) on being treated with para-toluene sulphonic acid yields the corresponding ester.

However, the disconnection of a bond within a monocyclic system shall be a retro-synthetic ring-opening phenomenon, otherwise termed as the retro-synthetic approach. Likewise, the disconnection of a bond caused in a bridged-structure would ultimately produce either a mono- or a di- substituted monocyclic structure. Sometimes, it may also be possible to accomplish two-bond disconnections taking place almost simultaneously. A double-line arrow is invariably used to indicate a reaction written backwards—the actual reaction in reverse.

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Advanced Practical Medicinal Chemistry by Ashutosh Kar

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