A step in a synthesis of PGE1 (prostanglandin E1, alprostadil) is reaction of a trisubstituted cyclohexene with bromine to form a bromolactone. Alprostadil is used as temporary therapy for infants born with congenital heart defects that restrict pulmonary blood flow. It brings about dilation of the ductus arteriosus, which in turn increases blood flow in the lungs and blood oxygenation. Propose a mechanism for formation of This bromolactone, and account for the observed stereochemistry of each substituent on the cyclohexane ring.

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Chapter1: Chemical Foundations
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  1. A step in a synthesis of PGE1 (prostanglandin E1, alprostadil) is reaction of a trisubstituted cyclohexene with bromine to form a bromolactone. Alprostadil is used as temporary therapy for infants born with congenital heart defects that restrict pulmonary blood flow. It brings about dilation of the ductus arteriosus, which in turn increases blood flow in the lungs and blood oxygenation.

Propose a mechanism for formation of This bromolactone, and account for the observed stereochemistry of each substituent on the cyclohexane ring.

Chapter 20: Functional Derivatives of Carboxylic Acids
20.35 A step in a synthesis of PGE|, (prostaglandin E1, alprostadil) is reaction of a trisubstituted
cyclohexene with bromine to form a bromolactone. Alprostadil is used as a temporary therapy
for infants born with congenital heart defects that restrict pulmonary blood flow. It brings
about dilation of the ductus arteriosus, which in turn increases blood flow in the lungs and
blood oxygenation.
Br
„CH,CO,H
`CH,CO,H_steps
many
„CO,H
+ Br2.
o CH,
CH,CO,H
CH3
НО
OH
A bromolactone
PGE,
(Alprostadil)
Propose a mechanism for formation of this bromolactone, and account for the observed ster-
eochemistry of each substituent on the cyclohexane ring.
Transcribed Image Text:Chapter 20: Functional Derivatives of Carboxylic Acids 20.35 A step in a synthesis of PGE|, (prostaglandin E1, alprostadil) is reaction of a trisubstituted cyclohexene with bromine to form a bromolactone. Alprostadil is used as a temporary therapy for infants born with congenital heart defects that restrict pulmonary blood flow. It brings about dilation of the ductus arteriosus, which in turn increases blood flow in the lungs and blood oxygenation. Br „CH,CO,H `CH,CO,H_steps many „CO,H + Br2. o CH, CH,CO,H CH3 НО OH A bromolactone PGE, (Alprostadil) Propose a mechanism for formation of this bromolactone, and account for the observed ster- eochemistry of each substituent on the cyclohexane ring.
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