Diastereomers 2 were prepared via molecule 1. Provide a complete curved arrow mechanism for the most straightforward conversion of 1 to 2 using the reagent given.
a. Attack of the nucleophile on the electrophilic center of 1
b. Formation of a new bond and breaking of existing bonds
c. Rearrangement of electrons to form the diastereomeric product
d. Proton transfer or other necessary steps for completion
