Processes and intermediates for preparing MCL1 inhibitors

A compound selected from:

• wherein
• each Rn is independently C1-6alkyl, or the two Rn moieties join together to form a C2-4alkyl bridge, wherein the bridge is optionally substituted by one to four groups independently selected from C1-3alkyl and phenyl;
• and
• Rz is halogen or CN.