give a general reaction of asymmetric 1, 2-aminohydroxylation of alkenes using (DHQ)2-PHAL AD catalyst in the presence of (TsNCINa). Also give various nitrene equivalents which are frequently as reagents in this reaction.
The asymmetric 1,2-aminohydroxylation of alkenes is an important method for the preparation of vicinal amino alcohols with high enantioselectivity. A general reaction involves the use of a chiral ligand such as (DHQ)₂-PHAL in combination with an oxidant in the presence of nitrene precursors. In the typical protocol, ____ ________ __________ _______ _____ _________ _______ __________.
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) Vilsmeier-Haack reaction of benzofuran
How many signals will appear in the 1H-NMR of the following compounds?
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Thexylborane
Chlorination of benzothiophene
Discuss the disconnections for the synthesis of paracetamol. Also write its scheme of synthesis. Draw the general scheme/mechanism of Stille coupling reaction. Give examples of some additives which are used to increase the rate of these reactions.
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