Synthetic intermediates A and B has to be drawn. Concept Introduction: Conversion of alcohol into haloalkane: Conversion of primary and secondary alcohols to Chloroalkane is thionyl chloride. The reaction is carried out in the presence of base such as pyridine or trimethylamine. The reaction of an alcohol with thionyl chloride is the formation of an alkyl Chlorosulfite that converts hydroxide ion (poor leaving group) into Chlorosulfite (good leaving group). Nucleophilic displacement of this leaving group gives product. Leaving group: Leaving group can be any groups or atoms that get detached from either neutral or charged organic compounds. The stability of the leaving group is to stabilize the electron density that results from heterolysis cleavage of bond.

Question

Paroxetine (Paxil) is an antidepressant that is a member of a family of drugs known as Selective Serotonin Reuptake Inhibitors (SSRIS). This family of drugs also includes fluoxetine (Prozac) and sertraline (Zoloft). SSRIS work by inhibiting the reuptake of the neurotransmitter serotonin in the synapses of the central nervous system follow- ing release of serotonin during excitation of individual nerve cells. Between firings, the serotonin is taken back up by a nerve cell in preparation for firing again. Inhibition of reuptake has the effect of increasing the time serotonin molecules remain in the syn- apses following excitation, leading to a therapeutic effect. In one synthesis of parox- etine, the following reagents are used. Draw the structures of synthetic intermediates A and B. F НО SOCI, A B HO Pyridine

Answer 1

Question

Chapter 10, Problem 10.58P

Interpretation Introduction

Interpretation:

Synthetic intermediates A and B has to be drawn.

Concept Introduction:

Conversion of alcohol into haloalkane:

Conversion of primary and secondary alcohols to Chloroalkane is thionyl chloride. The reaction is carried out in the presence of base such as pyridine or trimethylamine.

The reaction of an alcohol with thionyl chloride is the formation of an alkyl Chlorosulfite that converts hydroxide ion (poor leaving group) into Chlorosulfite (good leaving group). Nucleophilic displacement of this leaving group gives product.

Leaving group: Leaving group can be any groups or atoms that get detached from either neutral or charged organic compounds. The stability of the leaving group is to stabilize the electron density that results from heterolysis cleavage of bond.

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